EP0792467A1 - Detecteurs tactiles capacitifs - Google Patents

Detecteurs tactiles capacitifs

Info

Publication number
EP0792467A1
EP0792467A1 EP95936693A EP95936693A EP0792467A1 EP 0792467 A1 EP0792467 A1 EP 0792467A1 EP 95936693 A EP95936693 A EP 95936693A EP 95936693 A EP95936693 A EP 95936693A EP 0792467 A1 EP0792467 A1 EP 0792467A1
Authority
EP
European Patent Office
Prior art keywords
detector
touch
sensor
pads
capacitance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95936693A
Other languages
German (de)
English (en)
Inventor
James Peter Tagg
Alastair James Campbell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Moonstone Technology Ltd
Original Assignee
Moonstone Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Moonstone Technology Ltd filed Critical Moonstone Technology Ltd
Publication of EP0792467A1 publication Critical patent/EP0792467A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/088—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • H03K17/9622—Capacitive touch switches using a plurality of detectors, e.g. keyboard

Definitions

  • the present invention relates to capacitive touch operated devices.
  • the device also includes a circuit arrangement for detecting the change in capacitance, which includes a fixed frequency oscillator, the amplitude, output and/or phase of which is dependent on the change in capacitance.
  • Capacitive sensors can be constructed using the technology described by patent 2,250,822 B.
  • these proposals suffer from a number of problems: particularly, static sensitivity and frequency lockup.
  • a means of multiplexing a number of channels is required without the multiplexing element reducing the sensitivity of the channel by loading it.
  • Previous patent applications have described a way of organising a set of buffered multiplexers but we have appreciated that these proposals suffer from a number of
  • a controller is connected to a number of pads or capacitive sensing zones by way of buffered multiplexer chips and, shielded connectors and cables.
  • the buffered multiplexer chips can be cascaded in series or
  • a level translator which can in its simplest form comprise a resistor and capacitor network but should preferably comprise active elements. This ensures that the base voltage on (the voltage first applied in a halfwave to) a sensor pad is also applied to its shield and various parts (e.g. power supply rails, control port, chip substrate) of its associated multiplexers.
  • the signals derived from this electronic scanning array are then further processed by a signal processor incorporating a microprocessor.
  • the improvements made which constitute this invention relate to obtaining and processing the signal both in the analogue and digital domains which allow more reliable touch detection.
  • each sensor pad is capable of detecting the proximity of a finger in a continuously increasing manner, starting from say one inch (2cm) away all the way up to contact.
  • a simple "threshold level” so that when the finger is closer than a certain point a key-press is indicated.
  • Dual surface sensors where two orthogonal arrays are printed on two different layers and sandwiched together.
  • the lop layer must provide gaps through which the bottom sensor can see.
  • a preferred embodiment of a construction method for an orthogonal screen is described with the aid of diagrams in Figures 23-24. We now describe the location geometry for a single surface symmetrical array.
  • the dimension a is the area of a Hat plate having the same capacitance effect as the curved finger tip.
  • the relinearisalion mapping can be stored as a lookup table in a digital memory, e.g. an EPROM or E 2 PROM, usually after calibration with a test "finger" (equivalent plate) in various positions when the keypad is in situ e.g. on a window.
  • a digital memory e.g. an EPROM or E 2 PROM
  • the grid of row and column wires is affected dramatically by the touch of a finger due to the capacitive snap effect as air is excluded from under the finger tip.
  • a simple way of determining palm effect is look al the second adjacent wires i.e. two away from the most touched wire rather than one away from the most touched wire and calculating a linear interpolated position as described above. This method produces a new estimated point offset from the first adjacent point by an amount
  • one general solution to the above problem is not time consuming: that is to find the weighted mean (centre of gravity) of all the wires in the grid.
  • This weighted mean can then be scaled to represent a position on the grid. Since this weighted mean is calculated using all of the wires on the grid it will be more affected by the palm than a method using only two or three wires on the grid. The difference in estimated position between the two methods is then a function of the effect due to the palm and can be applied to the less affected measure of position to more accurately locate the point of touch.
  • the methods described in this specification for finding a position are usually described for the X dimension using the columns in an X,Y grid. It is clear that by substituting rows for columns the position in Y can be determined.
  • the description refers to a small (i.e. low cost) microprocessor but could be generalised to any form of digital logic, ASIC, neural network and so on, or a small portion of the duty cycle of a larger processing unit.
  • the shield is driven with a very high fidelity
  • long cables can be employed which have a high co-capacitance (between sensor pad and shield)
  • Well shielded wires can be employed which reduced emission and
  • the buffering/bootstrapping of many parts of the multiplexer chip allows a large number of series or parallel multiplexers to be employed.
  • Reduced static sensitivity can be achieved by a number of signal
  • Figure 5 shows some processing methods in the digital domain
  • Figure 29 shows some techniques to remove static sensitivity in the analogue domain.
  • Reduced frequency lockup when a high voltage interfering signal is present, such as near a monitor, is accomplished by running the detector circuit at a frequency which is not harmonically related to that of the noise source.
  • the touch point is generated by the change from the rapid increase in the capacitance of the finger as the soft tissues of the finger pad compress and slow speed of capacitance increase as the bony parts of the finger start to press. This change is similar for big and small hands and light and heavy touches, so the perceived touch point is similar for all users.
  • the interpolated position is derived by taking a proportion between two averages. Noise present on one line tends to be present on all lines. Therefore the proportional calculation being differential is immune to common mode noise.
  • the end points are defined by crossing points of actual data taken in real time rather than any pre -calibrated/stored value so variations in ambient conditions and the nature of the touch are taken into account in real time.
  • pads can be of many different sizes and materials but it is important to bear certain fundamental physical limitations in mind with reference to pad size and cable length. This can be summarised in the general principle that the
  • obscuring capacitance due to these must not outweigh that being measured and preferably should be much less. As disclosed herein, various means are used to back off or make ineffective such obscuring capacitance.
  • a sensing column designed to give information regarding the X position of a finger should be no wider than 30 mm. It.s length can be the appropriate dimension to the viewing area.
  • the column and row areas should be separated by as small a distance as possible to reduce the shielding effect of one layer on another. However to small and the coupling capacitance between layers reduces independent orthogonal information. A separation of 0.25 mm has been found to be optimal.
  • Capacitive pads connected to a controller by wires
  • Keypads A major application of the invention is to a touch screen.
  • Figure 1 is a diagram of touch pad arrangement embodying the invention
  • Figure 2 is a diagram of electronic arrangement embodying the invention
  • FIG. 3 is a diagram of touch arrangement embodying the invention.
  • Figure 4 is a diagram of snap "effect" of capacitive touch-down detection embodying the invention
  • Figure 5 is a diagram of a static reduction algorithm embodying the invention
  • FIG. 6 is a diagram of transparent pad construction embodying the invention.
  • FIG. 7 is a diagram of multiple sensor detection embodying the invention.
  • Figure 8 is a diagram of simplified location geometry embodying the invention and showing mathematics o multiple sensors;
  • Figure 9 is a diagram of hexagon grid embodying the invention.
  • Figure 10 is a diagram of orthogonal wires embodying the invention.
  • Figure 1 1 is a diagram of geometry of hexagon grid embodying the invention
  • Figure 12 is a diagram of transparent pad connection to multiplexer embodying the invention
  • Figure 13 is a diagram of shielding effect of buffer embodying the invention
  • FIG 14 is a diagram of touch process embodying the invention.
  • Figure 15 is a diagram of field around sensor pad embodying the invention.
  • FIG. 16 is a diagram of use of sensor pad embodying the invention.
  • Figure 17 is a diagram of charge -discharge cycle of sensor pad embodying the
  • Figure 18 is a diagram of impedance-matching circuit embodying the invention.
  • Figure 19 is a diagram of response path upon use of a touch detector
  • Figure 20 is a graph of the capacitances versus lime seen by an array of sensing zones as a finger approaches and touches on one of the zones;
  • Figure 21 is a as above but for the rate of change of capacitance
  • Figure 22 is a graph of the contents of the accumulators over time for the same touch as 21 & 20 above;
  • Figure 23 is a general arrangement drawing for a touchscreen using orthogonal sensing elements on two surfaces
  • Figure 24 is a detail from one layer of the general arrangement drawing above;
  • Figure 25 is a graph of the capacitance with time of a number of sensing zones as a finger is dragged across the screen;
  • Figure 26 is a diagram of a finger and hand showing palm rejection
  • Figure 27 is a diagram of a single surface asymmetrical sensor arrangement 'backgammon grid'
  • Figure 28 is a drawing of an etch pattern more appropriate to the laser etching of glass sensors.
  • Figure 29 is a circuit diagram of the electronic components arranged around
  • Figure 1 shows a series of backlightable pads [2], placed behind display
  • FIG. 1 shows the arrangement of the signal processing electronics.
  • a control means [1] sets an oscillator [2] to oscillate at a frequency F.
  • the frequency is fed to a Flip/flop [3] which divides the signal on alternate cycles thus generating a quadrature output.
  • An optional phase delay [5] is introduced to the 90 degree
  • the original signal is connected to the sensor [13] via a high value resistor and one or more buffered multiplexers [ 10,11]. These multiplexers may be located in proximity to the control means or addressed via a remote logic [14].
  • the squarewave frequency signal charges and discharges the plate through the high value resistor.
  • the signal seen on the other side of the resistor is approximately a sine wave
  • the elements [6,7,8] form a standard synchronous demodulator which provides a demodulated output to a analogue to digital converter [9] which can be read my a microprocessor, not shown.
  • Figure 3 - shows in schematic form the equipotential lines [2] formed when
  • a earthed finger [ 1 ] approaches a sensor pad [3] in the presence of a cojacent buffer [5].
  • An insulating layer of finite thickness [4] separates sensors from the cojacent buffer plane.
  • the diagram represents the lines of equal voltage at a given moment in time T. The degree to which the lines are compressed gives a graphical indication to
  • a soltware algorithm can make use of the adjacent pads to interpret information about the size and shape of a touching object. For example in the case of a drawing application a user could draw with their finger and rub out with the flat of their hand.
  • Figure 4 shows a graph of two related variables: position/distance against time for a finger touching a hard surface and the capacitance of a sensor arrangement as it is touched by a finger.
  • the normal capacitance of an untouched sensor rests at the baseline. Due to the buffer this baseline represents a very low capacitance.
  • Figure 6 - shows a novel construction for a transparent backlightable pad.
  • the pad itself is simply constructed from a single sheet of glass with transparent conductive surfaces on lop and bottom [3]. It is desired to connect a piece of coaxial cable [5] to the glass but at the same time making one surface completely Jlat so that it can be placed behind and uniformly pressed up against a piece of translucent artwork.
  • a small notch [1 ] into which the centre wire will be placed is cut in the top surface of the glass at the edge.
  • a "frit" pattern [2] is deposited across this notch which comprises a small and extremely thin section of silver-loaded paint. A solder bond can then be made in the notch [ 1] such that it is not higher than the surface of the glass.
  • FIG. 7 - shows schematically a finger about to touch a glass plate with a series of capacitive sensors on the underside. The distance between the finger and each sensor relates to the capacitance according to Gauss's law.
  • FIG 8 The capacitive analogue of the distance between several sensors can be ascertained and converted to distances a, b and c. Using standard trigonometrical
  • Figure 9 hows one of many possible arrangements of sensing elements. In this case in a hexagonal pattern of sensors each sensor connection back to one of the
  • channel of multiplexer input is many other shapes, f r example, orthogonal patterns of squares or other shapes, crossing matrices of wires or any other three dimensional arrangement of sensors.
  • Figure 10 - shows an array of orthogonal wires. Each wire is independently addressable through a multiplexer arrangement. The capacitance of each wire changes in the presence of a finger giving an X and Y co-ordinate for the touch point. Due to the buffer the field from each wire is linearised and background capacitance is removed. The removal of this background capacitance is of benefit as the subsequent detection of the finger has a far greater effect on the wire and also establishes the snap
  • the buffer increases overall sensitivity - subtracting the background capacitance. 2.
  • the buffer increases local sensitivity by concentrating the field in a
  • the buffer field effectively wraps
  • a key difference between the GB 2,250,822 patent and this application relates to the use of different (but not variable) frequencies for each key.
  • the impedance of the high value resistor and the impedance of the capacitor formed by one's hand and
  • the glass need to be approximately equal for optimum touch detection. Since the impedance of a capacitor is frequency variable changing the frequency balances these two impedances. See Figures 17, 18, 19.
  • Figure 20 shows a graph of a very slow touch.
  • the X axis shows capacitance with low numbers indicating higher capacitance and the Y axis shows lime where each unit represents a time interval of approximately 12mS in which 16 elements are scanned sequentially.
  • the lines on the graph represent the output of two sets of 8 scanning elements arranged orthogonally as described in relation to Figure 10 being scanned in quick succession.
  • the graph is split into 3 portions [ 1 ], [2] & [3].
  • Portion 1 is the slow approach of the finger.
  • Portion 2 represents the part of touch after the finger has touched down. Note the sudden change of slope between portions [1 ] & [2] which is the capacitive snap as the air is excluded from between fingertip and glass.
  • the final portion [3] is the release of the finger.
  • the most affected element and second most affected in the array are signified by the two lowest lines measured
  • Figure 21 shows the rale of change of capacitance with time, dC/dT on the same time scale as Figure 20.
  • the numeral references correspond to those described above for Figure 20. It can be seen from ihis graph that simply attempting to locate the maximum rate of change indicated by the capacitive snap effect is not a very
  • Figure 22 shows the accumulator method in action.
  • An accumulator is a memory element which holds the sum of the numbers input to it. While the rate of change of value of a particular wire is greater than a certain threshold this rate of change is added to its accumulator: portion [ 1] of the graph. When the rate of change
  • Figure 23 shows the general arrangement of a touch screen formed from two sets of 8 orthogonal capacitive zones formed by etching a transparent conductive sheet. These zones are labelled 1 lo 8 and A to H in the Figure.
  • the sheets are stacked in layers as follows: row layer [14], column layer [ 15], rear shield [16].
  • Each capacitive sensor zone for example the cross hatched zone marked
  • [19] is formed from a number of thin strips shown al [12] &. 1 13] (approx 5mm wide) with gaps between (approx 5mm wide), electrically connected together at each side of the screen and then to wires [9] which are formed from conductive silver track and lead back to an edge connector.
  • a 16 channel capacitance measuring device (not shown) is connected to the edge connector. Since the aspect ratio of a television set or computer monitor is 4:3, the column zones are divided into four strips and the rows into three strips. This division ratio maintains constructional symmetry. The columns and rows are on separate sheets of material [ 14] & [ 15] and stacked together. The main reason for .splitting the columns in thin strips is to provide gaps through which the row sensors can delect the finger. If the columns were not split up they would
  • Figure 24 shows the column layer alone.
  • Figure 25 shows the data derived from a set of capacitive columns and used
  • the graph represents the capacitance measured from a series of wires as a finger is moved from left to right across the screen.
  • the X axis of the graph is time & distance, where each unit represents approximately 1/lOOth of a second or 0.25 mm.
  • the Y axis gives a measure of the capacitance (measured by the 10 bit A/D converter of a microprocessor.)
  • a series of 8 capacitive zones are represented as points upon the graph which form 'bell' curves as illustrated by [1 1] along with two averages [7] & [8] which form flattened bell curves.
  • Each capacitive zone increases its response as the finger moves from near it on one side, to dead centre, to far away on the other side, in a curve [1-3] approximating an upturned bell curve as illustrated by [ 11]. Due to the arrangement of the zones in close proximity to each other, these bell curves overlap one another.
  • each unit on the X axis not only represents a moment in time but also a distance
  • the object is therefore to take a set of n data points (8 in this embodiment) at a moment in lime and determine where they must come from in terms of the distance
  • the second most pressed column is then found by comparing the value on the wire adjacent to the most pressed column, i.e. the magnitude of the bell curves [1 ] & [3] at the iniersection with sample line [ 10]. This will put the touch point somewhere to the left or right of line [5]. In this example ihc point must be to the left as [1] is greater than [3] at the intersection with the sample line [ 10].
  • & [9] is therefore some function of the distance between the two lines [4] & [5]. This function can be determined either experimentally, and then programmed into a look up table, or mathematically, and then applied to the raw data to compute the position.
  • a linear relationship generates a reasonable interpolation of position with some improvement generated by using a quadratic function or a series of straight line segments approximating a quadratic function.
  • Figure 26 shows in plan and elevation a hand [4] with outstretched finger [5] on a touch screen [6] and the apparent positions calculated by two algorithms - geometric [2] and weighted mean [3]Wi ⁇ h the palm and knuckles a long distance back from the screen, both algorithms give similar touch coordinates near to point [ l]When significant palm effect is introduced (the hand brought very close to the screen as the screen is touched), the geometric algorithm moves about 5%, i.eto point [2]The cenlre- of-mass algorithm gives a bigger offset moving to point [3] for the same degree of palm introductionThus, by calculating the difference between these two calculated positions [2] & [3], an estimate of the true touch position [ 1 ] is obtained.
  • Means Means
  • Figure 27 is a diagram of a single surface asymmetrical sensor arrangement
  • positionPosilion in Y can be determined by comparing the effect between even numbered and odd numbered zonesErrors are introduced by the complex geometry of the grid and an iterative approach is required to find an accurate position on the grid.
  • Figure 28 is a drawing showing a general arrangement for la.ser etching the coating from electrically conductive glass [ 1 ] to form the column layer as described in relation to Figure 24 without introducing unwanted capacitive couplingln the Figure
  • the gaps in between lines were chemically etched to remove the entire material and provide holes for the rows to sense through
  • the preferred glasses for construction are not easily chemically etched and so a laser is usedA la.ser is unable to remove large areas, being fundamentally designed to cut lines
  • the gaps between sensors are first cut away with long lines [2]Although this removes them from the general material of the front sensor it leaves long floating strips of material which lend to couple all the row sensors logelherThese rectangles are therefore further cut by making cross cuts [3]Thus, although the rows capacitively couple lo these small areas, Ihey do not then couple to other rows, and crosstalk is kept to an acceptable level.
  • Figure 29 is the circuit diagram of an improved capacitance detection means more able to differentiate noiseA capacitive sensing plate [ 1 ] and buffer plate [2] are set to measure the capacitance of a fingerNoise sources VI, V2 & V3 impinge upon these plates erroneously triggering the detection meansA number of beneficial modifications have been made compared with the circuits disclosed in previous patents to limit the excursions of the circuit due to these noise sourcesD2,D3 & R3 form a clipping circuit which limits the voltage excursions on the buffer to one diode drop of the mean poin Thus the energy content of high voltage static spikes and monitor
  • Said signal processing means comprising: a detector sensitive to changes in the capacitance of a sensor by detecting the current/voltage/phase change across an impedance connected to a varying signal , and the signal present on the sensor feed back through a finite frequency response buffer amplifier to one or more shield planes
  • Signal processing means so arranged as to differentiate between a deliberate touch and noise or an unwanted touch by reference to many sensors.
  • Signal processing means so arranged as to differentiate between a deliberate touch and noise or an unwanted touch by reference lo the capacitive
  • Signal processing means so arranged as to immediately, within ⁇ 50mS, indicate to the u.ser the detection of their touch via the Hashing or turning on of a light or similar optical change through the touch detection sensor.
  • Artwork and detection means placed behind a window and so designed as to present the u.ser with one or more touch zones which are operable through that window and upon touching cause a reaction.
  • One or more sensitive pads connected via shielding means to a control means which detects the touch of a human finger on the pad through that window and via the control means generates an electrical signal which can operate equipment.
  • the pad is made from transparent material so that the artwork can be backlit through the pad or so that an image can be seen through the pad.
  • the pad is made from a translucent and optionally coloured material that provides a degree of light diffusion such that the back light is evenly distributed across the artwork.
  • the pad is made from a grid or mesh of conductive elements such that it is partially transparent/translucent.
  • controlling electronics is implemented by utilising a means of applying an o.scillating signal of a particular frequency onto a plate via a high value resistor and monitoring the signal alter the high value resistance with an
  • the amplifier means provides a buffering signal which varies in synchronisation with the sensor signal and is applied lo a number of guards.
  • guard element includes a multiplexing element.
  • multiplexing element is controlled by way of a level translator means such that the buffer is always operating within it design parameters.
  • multiplexer line is connected to the sensor input.
  • a means for detecting a touch on a surlace connected to a means of generating vibration on said surface such that that vibration provides tactile
  • a plurality of capacitive proximity sensing elements connected to control means such that the position of a finger over a surface can be determined in
  • Capacitive elements arranged as a "String of beads" such that each capacitive sensing element comprises of a pad connected to the previous pad by way
  • a capacitive element where the capacitance and resistance are distributed rather than formed from lumped elements.
  • a reset feature for this, so as to adapt the sensitivity lo each operator, for example automatic, e.gresponsive to an interval between presses longer than usual (or longer than a preset
  • a control means so programmed as to differentiate between a deliberate touch and an accidental touch or other interfering electrical signal using information from one or more untouched keys and the knowledge of the initial conditions of the
  • a control means programmed to monitor the initial condition and sensitivity of each sen.sor and detect variations from those initial conditions by utilising a non-linear equation with reference to the initial conditions parameter and so normalising variations in sensitivity between differing sensor channels.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Electronic Switches (AREA)
  • Position Input By Displaying (AREA)

Abstract

Ces détecteurs tactiles capacitifs présentent une meilleure sélectivité grâce à un tampon à bande étroite. La réduction de l'effet de bruit est obtenue par couplage capacitif du tampon dans le détecteur, lequel se compose de plusieurs pastilles sensibles ayant des capacitances inhérentes variables et de modules d'approximation des impédances intégrant lesdites capacitances et conçus pour fonctionner aux différentes fréquences utilisées pour l'approximation des impédances. Au moins deux multiplexeurs sont montés en série pour réduire la charge capacitive des pastilles sensibles. Un démodulateur synchrone est nécessaire pour faire office de filtre passe-bande et suivre la fréquence du signal de mesure de la capacitance entre les pastilles sensibles, éventuellement pendant leur balayage. Un régisseur est relié à un certain nombre de pastilles ou de zones sensibles capacitives au moyen de puces de multiplexage tamponnées et de connecteurs et de câbles blindés. Les puces de multiplexage tamponnées peuvent être montées en série ou en parallèle et sont pilotées par un translateur de niveau composé au minimum d'un réseau de résistances et de condensateurs mais comprenant de préférence aussi des éléments actifs. De la sorte, la tension de base (c'est-à-dire la tension de la première demi-onde) appliquée à une pastille sensible est aussi appliquée à son blindage et aux diverses parties (par exemple pôles d'alimentation accès maître et substrat de la puce) du(des) multiplexeurs au(x)quel(s) elle est raccordée. Les signaux provenant de ce balayage électronique sont ensuite analysés au moyen d'une unité de traitement des signaux comprenant un microprocesseur. L'innovation vient de ce qu'il est possible d'obtenir et de traiter le signal en mode analogique aussi bien que numérique et d'obtenir une détection tactile plus fiable, y compris par interpolation.
EP95936693A 1994-11-14 1995-11-14 Detecteurs tactiles capacitifs Withdrawn EP0792467A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9422911 1994-11-14
GB9422911A GB9422911D0 (en) 1994-11-14 1994-11-14 Capacitive touch detectors
PCT/GB1995/002678 WO1996015464A1 (fr) 1994-11-14 1995-11-14 Detecteurs tactiles capacitifs

Publications (1)

Publication Number Publication Date
EP0792467A1 true EP0792467A1 (fr) 1997-09-03

Family

ID=10764340

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95936693A Withdrawn EP0792467A1 (fr) 1994-11-14 1995-11-14 Detecteurs tactiles capacitifs

Country Status (5)

Country Link
US (1) US20030067451A1 (fr)
EP (1) EP0792467A1 (fr)
AU (1) AU3853795A (fr)
GB (1) GB9422911D0 (fr)
WO (1) WO1996015464A1 (fr)

Families Citing this family (132)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1717683A3 (fr) 1998-01-26 2010-03-17 Apple Inc. Procédé et dispositif d'intégration d'entrée manuelle
US7663607B2 (en) 2004-05-06 2010-02-16 Apple Inc. Multipoint touchscreen
US6297811B1 (en) 1999-06-02 2001-10-02 Elo Touchsystems, Inc. Projective capacitive touchscreen
US6504530B1 (en) 1999-09-07 2003-01-07 Elo Touchsystems, Inc. Touch confirming touchscreen utilizing plural touch sensors
US6492979B1 (en) 1999-09-07 2002-12-10 Elo Touchsystems, Inc. Dual sensor touchscreen utilizing projective-capacitive and force touch sensors
DE29920733U1 (de) * 1999-11-26 2001-04-05 Platz Karl Otto Kapazitive Sensoren auf Glasbasis
US8788092B2 (en) 2000-01-24 2014-07-22 Irobot Corporation Obstacle following sensor scheme for a mobile robot
US8412377B2 (en) 2000-01-24 2013-04-02 Irobot Corporation Obstacle following sensor scheme for a mobile robot
US6956348B2 (en) 2004-01-28 2005-10-18 Irobot Corporation Debris sensor for cleaning apparatus
AU2001212370A1 (en) 2000-10-27 2002-05-06 Elo Touchsystems, Inc. Dual sensor touchscreen utilizing projective-capacitive and force touch sensors
US6661239B1 (en) * 2001-01-02 2003-12-09 Irobot Corporation Capacitive sensor systems and methods with increased resolution and automatic calibration
US6690134B1 (en) 2001-01-24 2004-02-10 Irobot Corporation Method and system for robot localization and confinement
US7571511B2 (en) 2002-01-03 2009-08-11 Irobot Corporation Autonomous floor-cleaning robot
DE10118061A1 (de) * 2001-04-11 2002-10-24 Bosch Gmbh Robert Kapazitives Sensorelement und Verfahren zur Herstellung eines kapazitiven Sensorelements
CN1320424C (zh) * 2001-05-21 2007-06-06 索尼公司 用户输入装置和与其相连的计算机及其控制方法
US8396592B2 (en) 2001-06-12 2013-03-12 Irobot Corporation Method and system for multi-mode coverage for an autonomous robot
US7429843B2 (en) 2001-06-12 2008-09-30 Irobot Corporation Method and system for multi-mode coverage for an autonomous robot
US6977646B1 (en) * 2001-11-30 2005-12-20 3M Innovative Properties Co. Touch screen calibration system and method
US9128486B2 (en) 2002-01-24 2015-09-08 Irobot Corporation Navigational control system for a robotic device
US7006078B2 (en) * 2002-05-07 2006-02-28 Mcquint, Inc. Apparatus and method for sensing the degree and touch strength of a human body on a sensor
JP3880888B2 (ja) * 2002-06-18 2007-02-14 Ｓｍｋ株式会社 タブレット装置
US8428778B2 (en) 2002-09-13 2013-04-23 Irobot Corporation Navigational control system for a robotic device
US8386081B2 (en) 2002-09-13 2013-02-26 Irobot Corporation Navigational control system for a robotic device
US7429979B2 (en) * 2002-10-16 2008-09-30 Thomson Licensing Remote control with programmable button labeling and labeling display upon button actuation
JP4383730B2 (ja) * 2002-10-22 2009-12-16 アルプス電気株式会社 タッチセンサを有する電子機器
US7362313B2 (en) * 2003-01-17 2008-04-22 3M Innovative Properties Company Touch simulation system and method
JP3693665B2 (ja) * 2003-08-06 2005-09-07 東京エレクトロン株式会社 容量検出回路及び容量検出方法
US7339579B2 (en) 2003-12-15 2008-03-04 3M Innovative Properties Company Wiring harness and touch sensor incorporating same
US7332890B2 (en) 2004-01-21 2008-02-19 Irobot Corporation Autonomous robot auto-docking and energy management systems and methods
US7855717B2 (en) * 2004-03-19 2010-12-21 Igt Touch screen apparatus and method
US7663606B2 (en) * 2004-03-19 2010-02-16 Igt Apparatus and method for configuring a touch screen
WO2005098476A1 (fr) 2004-03-29 2005-10-20 Evolution Robotics, Inc. Procede et appareil d'estimation de position a l'aide de sources de lumiere reflechie
WO2006002373A1 (fr) 2004-06-24 2006-01-05 Irobot Corporation Programmateur a telecommande et procede de telecommande pour dispositif robotique autonome
US8972052B2 (en) 2004-07-07 2015-03-03 Irobot Corporation Celestial navigation system for an autonomous vehicle
US7706917B1 (en) 2004-07-07 2010-04-27 Irobot Corporation Celestial navigation system for an autonomous robot
US8017890B2 (en) * 2004-07-20 2011-09-13 Massachusetts Institute Of Technology Continuous capacitive slider controller for a smooth surfaced cooktop
EP1626387A1 (fr) * 2004-08-10 2006-02-15 Frank Zimmermann Système de présentation pour une vitrine
DE202005001032U1 (de) * 2005-01-22 2005-05-12 Wessling, Herbert Spielautomat
US8392021B2 (en) 2005-02-18 2013-03-05 Irobot Corporation Autonomous surface cleaning robot for wet cleaning
EP2145573B1 (fr) 2005-02-18 2011-09-07 iRobot Corporation Robot de nettoyage autonome pour le nettoyage humide et à sec
US7620476B2 (en) 2005-02-18 2009-11-17 Irobot Corporation Autonomous surface cleaning robot for dry cleaning
US8930023B2 (en) 2009-11-06 2015-01-06 Irobot Corporation Localization by learning of wave-signal distributions
TW200712997A (en) * 2005-09-23 2007-04-01 Elan Microelectronics Corp Method for compensating sensitivity of touch pad sensor
EP2544065B1 (fr) 2005-12-02 2017-02-08 iRobot Corporation Système de robot
EP1969438B1 (fr) 2005-12-02 2009-09-09 iRobot Corporation Robot modulaire
US9144360B2 (en) 2005-12-02 2015-09-29 Irobot Corporation Autonomous coverage robot navigation system
EP2816434A3 (fr) 2005-12-02 2015-01-28 iRobot Corporation Robot à couverture autonome
KR101300493B1 (ko) 2005-12-02 2013-09-02 아이로보트 코퍼레이션 커버리지 로봇 이동성
US8018440B2 (en) 2005-12-30 2011-09-13 Microsoft Corporation Unintentional touch rejection
KR20070078522A (ko) * 2006-01-27 2007-08-01 삼성전자주식회사 표시 장치 및 액정 표시 장치
US7656392B2 (en) * 2006-03-24 2010-02-02 Synaptics Incorporated Touch sensor effective area enhancement
WO2007124754A2 (fr) * 2006-05-01 2007-11-08 Linak A/S Meuble réglable électriquement
EP2548489B1 (fr) 2006-05-19 2016-03-09 iRobot Corporation Élimination de débris de robots de nettoyage
US8417383B2 (en) 2006-05-31 2013-04-09 Irobot Corporation Detecting robot stasis
KR101452675B1 (ko) 2006-06-09 2014-10-22 애플 인크. 터치 스크린 액정 디스플레이
CN104965621B (zh) 2006-06-09 2018-06-12 苹果公司 触摸屏液晶显示器及其操作方法
US8243027B2 (en) 2006-06-09 2012-08-14 Apple Inc. Touch screen liquid crystal display
FR2910744B1 (fr) * 2006-12-26 2009-04-03 Brandt Ind Sas Procede de commande a touches sensitives, dispositif de commande et appareil domestique mettant en oeuvre un tel procede
FR2910745B1 (fr) * 2006-12-26 2009-02-27 Brandt Ind Sas Procede d'illumination d'une surface d'un dispositif de commande a touches sensitives, dispositif de commande et table de cuisson mettant en oeuvre un tel procede
US8232970B2 (en) * 2007-01-03 2012-07-31 Apple Inc. Scan sequence generator
US8269727B2 (en) 2007-01-03 2012-09-18 Apple Inc. Irregular input identification
US8711129B2 (en) * 2007-01-03 2014-04-29 Apple Inc. Minimizing mismatch during compensation
US8130203B2 (en) 2007-01-03 2012-03-06 Apple Inc. Multi-touch input discrimination
US8049732B2 (en) 2007-01-03 2011-11-01 Apple Inc. Front-end signal compensation
US8493330B2 (en) * 2007-01-03 2013-07-23 Apple Inc. Individual channel phase delay scheme
US9710095B2 (en) 2007-01-05 2017-07-18 Apple Inc. Touch screen stack-ups
US20080229885A1 (en) * 2007-03-22 2008-09-25 Mah Pat Y Jar opener
US8456427B2 (en) * 2007-03-29 2013-06-04 Cirque Corporation Floating capacitive couplers used to enhance signal coupling in a capacitive touchpad
US8239992B2 (en) 2007-05-09 2012-08-14 Irobot Corporation Compact autonomous coverage robot
US20080297174A1 (en) * 2007-05-31 2008-12-04 Sarangan Narasimhan Capacitive sensing devices
WO2009070814A2 (fr) * 2007-11-27 2009-06-04 Frederick Johannes Bruwer Élimination du bruit
US8284332B2 (en) * 2008-08-01 2012-10-09 3M Innovative Properties Company Touch screen sensor with low visibility conductors
KR101397200B1 (ko) 2008-02-28 2014-05-20 쓰리엠 이노베이티브 프로퍼티즈 컴파니 저 가시성 도체를 구비한 터치 스크린 센서
JP2011514597A (ja) 2008-02-28 2011-05-06 スリーエム イノベイティブ プロパティズ カンパニー 変化するシート抵抗を有するタッチスクリーンセンサ
EP3614418B1 (fr) 2008-02-28 2023-11-01 3M Innovative Properties Company Capteur d'écran tactile
JP2011517367A (ja) 2008-02-28 2011-06-02 スリーエム イノベイティブ プロパティズ カンパニー 基材上に導電体をパターン化する方法
US8619055B2 (en) * 2008-04-14 2013-12-31 Microsoft Corporation Active matrix touch sensing
WO2009129341A1 (fr) * 2008-04-15 2009-10-22 Mattel, Inc. Dispositif de télécommande à écran tactile s'utilisant avec un jouet
US8098240B2 (en) * 2008-06-20 2012-01-17 Mattel, Inc. Capacitive touchpad and toy incorporating the same
US8300019B2 (en) * 2008-07-15 2012-10-30 Apple Inc. Capacitive sensor coupling correction
KR100971501B1 (ko) * 2008-10-24 2010-07-21 주식회사 애트랩 접촉센서 장치
US20100201652A1 (en) * 2009-02-12 2010-08-12 Sony Ericsson Mobile Communications Ab Embedded piezoelectric elements in touch panels
US8976158B2 (en) 2009-02-15 2015-03-10 Neonode Inc. User interface for white goods and associated multi-channel proximity sensors
US8775023B2 (en) 2009-02-15 2014-07-08 Neanode Inc. Light-based touch controls on a steering wheel and dashboard
FR2943191B1 (fr) * 2009-03-13 2011-04-01 Valeo Securite Habitacle Procede de declenchement d'une action sur un ouvrant de vehicule automobile et dispositif correspondant
JP5287738B2 (ja) * 2009-03-16 2013-09-11 株式会社リコー 情報入力装置、画像形成装置、位置判断方法、及び位置判断プログラム
CA2753680C (fr) * 2009-03-25 2016-02-16 Alsentis, Llc Appareil et procede permettant de determiner une entree tactile
US8279194B2 (en) 2009-05-22 2012-10-02 Elo Touch Solutions, Inc. Electrode configurations for projected capacitive touch screen
US20100295813A1 (en) * 2009-05-22 2010-11-25 Tyco Electronics Corporation System and method for a projected capacitive touchscreen having grouped electrodes
US8477106B2 (en) 2009-07-29 2013-07-02 Elo Touch Solutions, Inc. System and method for a projected capacitive touchscreen having weight based coordinate determination
US8261213B2 (en) 2010-01-28 2012-09-04 Microsoft Corporation Brush, carbon-copy, and fill gestures
US9411504B2 (en) 2010-01-28 2016-08-09 Microsoft Technology Licensing, Llc Copy and staple gestures
US9519356B2 (en) 2010-02-04 2016-12-13 Microsoft Technology Licensing, Llc Link gestures
WO2011103198A1 (fr) 2010-02-16 2011-08-25 Irobot Corporation Brosse d'aspiration
US9367205B2 (en) 2010-02-19 2016-06-14 Microsoft Technolgoy Licensing, Llc Radial menus with bezel gestures
US9310994B2 (en) 2010-02-19 2016-04-12 Microsoft Technology Licensing, Llc Use of bezel as an input mechanism
US9965165B2 (en) 2010-02-19 2018-05-08 Microsoft Technology Licensing, Llc Multi-finger gestures
US9454304B2 (en) 2010-02-25 2016-09-27 Microsoft Technology Licensing, Llc Multi-screen dual tap gesture
WO2011130493A1 (fr) 2010-04-15 2011-10-20 Authentec, Inc. Capteur de doigt comprenant une lentille capacitive et procédés associés
US9727175B2 (en) 2010-05-14 2017-08-08 Elo Touch Solutions, Inc. System and method for detecting locations of touches on a projected capacitive touch sensor
EP2569687A2 (fr) 2010-05-14 2013-03-20 Elo Touch Solutions, Inc. Système et procédé pour détecter des emplacements de touchers sur un capteur tactile
US10268320B2 (en) * 2010-08-06 2019-04-23 Apple Inc. Method for disambiguating multiple touches on a projection-scan touch sensor panel
US8717331B2 (en) * 2010-08-24 2014-05-06 Cypress Semiconductor Corporation Reducing water influence on a touch-sensing device
AU2011293110B2 (en) 2010-08-27 2015-07-09 Uico, Inc. Capacitive touch screen having dynamic capacitance control and improved touch-sensing
US9459736B2 (en) * 2010-10-12 2016-10-04 Parade Technologies, Ltd. Flexible capacitive sensor array
US9454268B2 (en) 2010-10-12 2016-09-27 Parade Technologies, Ltd. Force sensing capacitive hybrid touch sensor
US8508502B2 (en) 2010-10-31 2013-08-13 Pixart Imaging Inc. Capacitive touchscreen system with touch position encoding during analog-to-digital conversion
US8841600B2 (en) 2010-10-31 2014-09-23 Avago Technologies General Ip (Singapore) Pte. Ltd. Hysteresis-compensating interpolation circuits in optical encoders
US8836666B2 (en) 2010-10-31 2014-09-16 Pixart Imaging Inc. Method and device for reducing noise interference in a capacitive touchscreen system
JP5671316B2 (ja) * 2010-12-01 2015-02-18 株式会社Ihi 宇宙浮遊物体検出装置
US10001883B2 (en) 2010-12-22 2018-06-19 Elo Touch Solutions, Inc. Mechanical deflection compensation for a capacitive touch input device
US9152278B2 (en) 2010-12-22 2015-10-06 Elo Touch Solutions, Inc. Background capacitance compensation for a capacitive touch input device
US8804056B2 (en) 2010-12-22 2014-08-12 Apple Inc. Integrated touch screens
TWI520040B (zh) 2011-04-08 2016-02-01 Elan Microelectronics Corp Capacitive touch panel with improved environmental impact and its application
DE102011116000A1 (de) 2011-10-14 2013-04-18 Grossenbacher System Ag Wand-Abdeckelement mit Erkennungssystem
US9552094B2 (en) * 2011-12-22 2017-01-24 Optis Circuit Technology, Llc User interface responsiveness in an electronic device having a touch screen display
US9727159B2 (en) * 2012-01-03 2017-08-08 Vadim Konradi Controller and method for controlling a capacitive touch screen or the like
US9870103B2 (en) * 2012-01-03 2018-01-16 Silicon Laboratories Inc. Controller and method for controlling a capacitive touch screen or the like
CN104603729B (zh) * 2012-04-27 2018-02-02 阿尔申蒂斯有限责任公司 用于确定触摸输入刺激的装置
JP5224203B1 (ja) 2012-07-11 2013-07-03 大日本印刷株式会社 タッチパネルセンサ、タッチパネル装置および表示装置
US9582122B2 (en) 2012-11-12 2017-02-28 Microsoft Technology Licensing, Llc Touch-sensitive bezel techniques
US9092093B2 (en) 2012-11-27 2015-07-28 Neonode Inc. Steering wheel user interface
US9851834B2 (en) 2013-09-10 2017-12-26 Alsentis, Llc Time domain differential techniques to characterize various stimuli
US9886142B2 (en) * 2013-12-03 2018-02-06 Pixart Imaging Inc. Capacitive touch sensing system
US9477337B2 (en) 2014-03-14 2016-10-25 Microsoft Technology Licensing, Llc Conductive trace routing for display and bezel sensors
US10345927B2 (en) * 2014-06-11 2019-07-09 Lenovo (Singapore) Pte. Ltd. Pen/stylus offset modification
US9436338B2 (en) 2014-12-22 2016-09-06 Microsoft Technology Licensing, Llc Active matrix capacitive touch sensor
CN105159518A (zh) * 2015-09-23 2015-12-16 深圳信炜科技有限公司 电容式传感装置、封装结构、感测模组、以及电子设备
US10768746B1 (en) 2016-05-10 2020-09-08 Apple Inc. Quasi-continuous-time sampling of discrete-time sampled signals
TWI622911B (zh) * 2017-02-14 2018-05-01 宏碁股份有限公司 觸控裝置
US10599259B2 (en) 2017-11-20 2020-03-24 Google Llc Virtual reality / augmented reality handheld controller sensing
CN113165515B (zh) 2018-11-28 2021-11-02 内奥诺德公司 驾驶员用户界面传感器

Family Cites Families (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696409A (en) * 1970-12-28 1972-10-03 Linquist & Vennum Finger-touch faceplate
CA970604A (en) * 1971-07-20 1975-07-08 Yasuji Uchiyama Touch-responsive keying circuit for electronic musical instruments
US3958239A (en) * 1972-03-24 1976-05-18 Green Robert E Capacitive transistorized signaling device
US4088904A (en) * 1973-09-27 1978-05-09 Green Robert E Capacitive transistorized signaling device
US4037221A (en) * 1974-05-16 1977-07-19 Alexander Jerry L Touch controlled switch assembly
US3925610A (en) * 1974-08-12 1975-12-09 Bell Telephone Labor Inc Graphic communications tablet
US4110748A (en) * 1976-04-06 1978-08-29 Burroughs Corporation Keyswitch with hysteresis
US4503745A (en) * 1976-06-11 1985-03-12 Melville Clark, Jr. Musical instrument
US4103252A (en) * 1976-11-26 1978-07-25 Xerox Corporation Capacitive touch-activated transducer system including a plurality of oscillators
US4145748A (en) * 1977-12-23 1979-03-20 General Electric Company Self-optimizing touch pad sensor circuit
US4224615A (en) * 1978-09-14 1980-09-23 Texas Instruments Incorporated Method of using a liquid crystal display device as a data input device
US4291303A (en) * 1979-08-23 1981-09-22 General Electric Company Touch pad and display tube circuitry
US4686332A (en) * 1986-06-26 1987-08-11 International Business Machines Corporation Combined finger touch and stylus detection system for use on the viewing surface of a visual display device
GB2059600A (en) * 1979-10-04 1981-04-23 Starcote Ltd Touch switch device
US4639720A (en) * 1981-01-12 1987-01-27 Harris Corporation Electronic sketch pad
EP0079711A3 (fr) * 1981-11-16 1984-10-03 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Commutateurs sensibles à l'effleurement
US4455452A (en) * 1982-09-13 1984-06-19 Touch Activated Switch Arrays, Inc. Touch activated controller for generating X-Y output information
JPS5987583A (ja) * 1982-11-11 1984-05-21 Sony Corp 位置検出装置
US4910504A (en) * 1984-01-30 1990-03-20 Touch Display Systems Ab Touch controlled display device
AU552619B2 (en) * 1984-02-29 1986-06-12 Fujitsu Limited Co-ordinate detecting apparatus
US4581483A (en) * 1984-03-30 1986-04-08 Koala Technologies Corporation Interface circuitry for interconnecting touch tablet with a computer interface
US4740781A (en) * 1985-02-08 1988-04-26 Itt Gilfillan Touch panel data entry device for thin film electroluminescent panels
US4736191A (en) * 1985-08-02 1988-04-05 Karl E. Matzke Touch activated control method and apparatus
US4680429A (en) * 1986-01-15 1987-07-14 Tektronix, Inc. Touch panel
GB8607747D0 (en) * 1986-03-27 1986-04-30 Duracell Int Device
US4698461A (en) * 1986-08-26 1987-10-06 Tektronix, Inc. Touch panel with automatic frequency control
US4707845A (en) * 1986-08-26 1987-11-17 Tektronix, Inc. Touch panel with automatic nulling
JPS6353132U (fr) * 1986-09-25 1988-04-09
US4806709A (en) * 1987-05-26 1989-02-21 Microtouch Systems, Inc. Method of and apparatus for sensing the location, such as coordinates, of designated points on an electrically sensitive touch-screen surface
US5053758A (en) * 1988-02-01 1991-10-01 Sperry Marine Inc. Touchscreen control panel with sliding touch control
US4853498A (en) * 1988-06-13 1989-08-01 Tektronix, Inc. Position measurement apparatus for capacitive touch panel system
US4931782A (en) * 1988-06-24 1990-06-05 E. I. Du Pont De Nemours And Company Touch screen overlay with improved conductor durability
US5305017A (en) * 1989-08-16 1994-04-19 Gerpheide George E Methods and apparatus for data input
DE4001814A1 (de) * 1990-01-23 1991-07-25 Vdo Schindling Auswerteschaltung fuer einen kapazitiven sensor
US5153572A (en) * 1990-06-08 1992-10-06 Donnelly Corporation Touch-sensitive control circuit
JP3094338B2 (ja) * 1990-06-14 2000-10-03 ソニー株式会社 情報処理装置及び情報処理方法
US5149919A (en) * 1990-10-31 1992-09-22 International Business Machines Corporation Stylus sensing system
US5117071A (en) * 1990-10-31 1992-05-26 International Business Machines Corporation Stylus sensing system
US5485092A (en) * 1991-08-01 1996-01-16 Fortin; Gabriel Method and device for electrostatically investigating surface and sub-surface structures
US5369228A (en) * 1991-11-30 1994-11-29 Signagraphics Corporation Data input device with a pressure-sensitive input surface
US5534892A (en) * 1992-05-20 1996-07-09 Sharp Kabushiki Kaisha Display-integrated type tablet device having and idle time in one display image frame to detect coordinates and having different electrode densities
US5214388A (en) * 1992-05-28 1993-05-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Phase discriminating capacitive array sensor system
US5914465A (en) * 1992-06-08 1999-06-22 Synaptics, Inc. Object position detector
US5543591A (en) * 1992-06-08 1996-08-06 Synaptics, Incorporated Object position detector with edge motion feature and gesture recognition
DE69324067T2 (de) * 1992-06-08 1999-07-15 Synaptics Inc Objekt-Positionsdetektor
US5543588A (en) * 1992-06-08 1996-08-06 Synaptics, Incorporated Touch pad driven handheld computing device
US5463388A (en) * 1993-01-29 1995-10-31 At&T Ipm Corp. Computer mouse or keyboard input device utilizing capacitive sensors
US5541371A (en) * 1993-06-01 1996-07-30 Holtek Microelectronics Inc. Palpably controllable digital plate
BE1007462A3 (nl) * 1993-08-26 1995-07-04 Philips Electronics Nv Dataverwerkings inrichting met aanraakscherm en krachtopnemer.
US5471192A (en) * 1994-01-24 1995-11-28 Dash; Glen Sound producing device stimulated by petting
US5457289A (en) * 1994-03-16 1995-10-10 Microtouch Systems, Inc. Frontally shielded capacitive touch sensor system
US5579036A (en) * 1994-04-28 1996-11-26 At&T Global Information Solutions Company Touch screen device and shielding bracket therefor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9615464A1 *

Also Published As

Publication number Publication date
AU3853795A (en) 1996-06-06
WO1996015464A1 (fr) 1996-05-23
GB9422911D0 (en) 1995-01-04
US20030067451A1 (en) 2003-04-10

Similar Documents

Publication Publication Date Title
EP0792467A1 (fr) Detecteurs tactiles capacitifs
US5945980A (en) Touchpad with active plane for pen detection
AU2015278796B2 (en) Capacitive based digitizer sensor
US6297811B1 (en) Projective capacitive touchscreen
US5149918A (en) Touch sensitive overlay
US8497844B2 (en) Capacitive touch panel with high touching sensitivity
US8981242B2 (en) Inductive touch sensor and detecting method
CN109085946B (zh) 水拒绝接近检测器和方法
JP6074408B2 (ja) タッチセンシティブスクリーン
CN104571686B (zh) 消除公共噪声的方法以及检测触摸信息的方法
US20100097328A1 (en) Touch Finding Method and Apparatus
KR940018729A (ko) 용량성 위치 센서
KR20120098749A (ko) 투과형 정전 용량 터치 감지
WO2015102977A1 (fr) Systèmes et procédés tactiles capacitifs utilisant des techniques de signal différentiel
US11561661B2 (en) Capacitive sensor filtering apparatus, method, and system
EP2013693B1 (fr) Agencement de capteur
US7119796B2 (en) Data input system
KR20190037099A (ko) 터치 입력 장치
JPS63136130A (ja) タッチパネル
US20110227823A1 (en) Puck-type pointing apparatus, pointing system, and pointing method
EP2710736A1 (fr) Capteur capacitif et procédé de détection d'un nombre d'objets
JPS6232490B2 (fr)
CN112099677A (zh) 一种用电器及其电容感应型输入检测装置
US20190317656A1 (en) Drive line allocation
US20130220672A1 (en) Single Layer Touch-Control Sensor Structure With Reduced Coupling To Proximate Ground Structures

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19970613

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19980603